First pass as implementing the greasemonkey API. This patch

chrome/renderer/user_script_slave.h

 // Copyright (c) 2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_SLAVE_H_
 #define CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_SLAVE_H_
 
 #include "base/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "base/string_piece.h"
@@ skipping 71 matching lines @@
   // testability.
   bool InjectScripts(WebFrame* frame);
 
  private:
   // Shared memory containing raw script data.
   scoped_ptr<base::SharedMemory> shared_memory_;
 
   // Parsed script data.
   std::vector<UserScript> scripts_;
 
+  // Greasemonkey API source that is injected with the scripts.
+  StringPiece api_js_;
+
+  // The line number of the first line of the user script among all of the
+  // injected javascript.  This is used to make reported errors correspond with
+  // the proper line in the user script.
+  int user_script_start_line_;
+
   DISALLOW_COPY_AND_ASSIGN(UserScriptSlave);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_SLAVE_H_